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Biomedical subjects

P Markowitz

Publications and source records attributed to P Markowitz.

21 records · Page 2Linked to original sources

Conscious and unconscious perceptions of self in children of alcoholics.

The conscious and unconscious self-concept was examined in three groups of children: 23 children of alcoholics (COA), 19 children from nonalcoholic but dysfunctional families, and 23 children from normal families without alcoholism or family dysfunction. Self-concept was assessed both objectively, using the Piers-Harris Children's Self Concept Scale, and subjectively, using the Draw-A-Person Test and the Thematic Apperception Test from rating systems designed to tap unconscious dimensions of self. The COAs and normal controls were also compared for behavioral problems with the Achenbach Child Behavior Checklist. We found that COAs made more positive self-statements on objective measures of self-concept than children from families without alcoholism, whether or not the families were dysfunctional. Subjective analyses of projective test responses revealed unconscious differences in self-concept among the COAs, though this was not corroborated with objective scores, probably due to the crudeness of the rating instrument in failing to tap these dimensions. Also COAs had significantly more behavior problems, based on parental reports, which contrasts with their objective reports of self. Implications of these findings were discussed.

Alcoholism↗

Increased membrane-associated protein kinase C activity and translocation in blood platelets from bipolar affective disorder patients.

BACKGROUND: recent investigations have suggested that the phosphoinositide (PI) signal transduction system may be involved in the pathophysiology of bipolar affective disorders. Earlier studies in our laboratory have implicated altered PKC-mediated phosphorylation in bipolar affective disorder and in the clinical action of lithium. In the present study, we compared PKC activity and its translocation in platelets from subjects with bipolar affective disorder and three other groups. METHODS: subjects included 44 with bipolar disorder (acute manic episode), 25 with acute major depression, 23 with schizophrenia in acute exacerbation and 43 controls free of personal or family history of an Axis I disorder. Blood platelet membrane and cytosol PKC activity was measured before and after in vitro stimulation with serotonin (5-HT), thrombin and the direct PKC activator, PMA. In addition, we examined 5-HT-, thrombin- and PMA-elicited translocations of PKC isozymes from cytosol to the membrane in platelets of control subjects. RESULTS: in the basal state, manic subjects demonstrated higher membrane PKC activity than depressive and control subjects. The ratio of membrane to cytosol PKC activity was significantly higher in manic (1.10), as compared to control (0.84), depressed (0.93) or schizophrenic (0.93) subjects. Stimulation of platelets with 5-HT in vitro, resulted in greater membrane to cytosol ratio in the manic subjects compared to the three other groups. The responsiveness of platelets to PMA and thrombin was greater for manic subjects than for depressed and schizophrenic subjects, but not greater than the controls. In this measure both the schizophrenic and depressive groups were less active than controls. The results also demonstrate that platelets contain alpha-, beta-, delta- and zeta-PKC isozymes. While alpha- and beta-PKC isoforms were translocated from cytosol to membrane in response to serotonin, PMA and thrombin, serotonin also elicited the redistribution of delta-PKC and thrombin also activated zeta-PKC. CONCLUSION: the results demonstrate that a heightened PKC-mediated signal transduction is associated with acute mania and suggest a decreased transduction in patients with unipolar depression or schizophrenia.

Acute Disease↗